Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4FOS callsign genealogy
Currently held by Chesapeake Center For Science And Technology HS ARC
The FCC publishes a previous_call_sign on
every amateur license — a self-link to the licensee's prior callsign.
Following those links produces the chain below.
Previous callsigns
Older callsigns held by W4FOS's current licensee, walking backwards.
- Foster, Samuel DFLgranted 2023-09-19cancelled 2023-10-07
Successor callsigns
Callsigns held now by people who previously held W4FOS.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W4FOS, oldest first.
- PATE, CLARENCE W AL1997-10-09 → cancelled 2009-10-10
- Chesapeake Center For Science And Technology HS ARC VA2009-10-31 → cancelled 2021-11-02
- Foster, Samuel D FL2023-10-07 active